Barraza J F, Colombo E M
Departamento de Luminotecnia, Luz y Visión, FACET, Universidad Nacional de Tucumán, Av. Independencia 1800, (4000), Tucumán, Argentina.
Vision Res. 2001 Apr;41(9):1139-44. doi: 10.1016/s0042-6989(01)00005-0.
To examine how the time course of rapid events of adaptation affect motion vision, the lower threshold of motion (LTM) was measured for suprathreshold sinusoidal gratings in presence of transient and steady glare. In the case of the transient condition, glare and stimulus were presented separated in time by a variable extent (SOA: 50-450 ms). A two alternative forced choice paradigm using the method of constant stimuli was adopted to measure the LTM. It was found that LTM follows the characteristic Crawford's time course of adaptation. Results are similar for two stimulus duration (300 and 500 ms). It was proposed that the increment of contrast threshold for displacing gratings (C(tq)) due to the loss of sensitivity produced by the sudden onset of the glare source can explain the results.
为研究快速适应事件的时间进程如何影响运动视觉，在存在瞬态和稳态眩光的情况下，测量了阈上正弦光栅的运动下限阈值（LTM）。在瞬态条件下，眩光和刺激在时间上以可变程度分开呈现（刺激 onset 异步性：50 - 450毫秒）。采用恒定刺激法的二择一强迫选择范式来测量LTM。发现LTM遵循特征性的克劳福德适应时间进程。两种刺激持续时间（300和500毫秒）的结果相似。有人提出，由于眩光源突然出现导致的敏感度损失而引起的位移光栅对比度阈值的增加（C(tq)）可以解释这些结果。
